/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.marmotta.ldcache.sail;
import org.apache.marmotta.commons.sesame.filter.SesameFilter;
import org.apache.marmotta.kiwi.sail.KiWiStore;
import org.apache.marmotta.ldcache.backend.kiwi.LDCachingKiWiBackend;
import org.apache.marmotta.ldcache.model.CacheConfiguration;
import org.apache.marmotta.ldcache.services.LDCache;
import org.apache.marmotta.ldclient.model.ClientConfiguration;
import org.openrdf.model.Resource;
import org.openrdf.sail.NotifyingSail;
import org.openrdf.sail.NotifyingSailConnection;
import org.openrdf.sail.SailException;
import org.openrdf.sail.StackableSail;
import org.openrdf.sail.helpers.NotifyingSailWrapper;
/**
* Add file description here!
* <p/>
* Author: Sebastian Schaffert (sschaffert@apache.org)
*/
public class KiWiLinkedDataSail extends NotifyingSailWrapper {
private KiWiStore store;
private LDCachingKiWiBackend backend;
private LDCache ldcache;
private SesameFilter<Resource> acceptor;
private String cache_context;
private CacheConfiguration config;
/**
* Creates a new SAIL with transparent Linked Data access. Caching information is stored in the underlying
* KiWi triple store.
*
* @param baseSail the wrapped SAIL; at the parent level must be a KiWiStore
* @param acceptor a filter that selects which resources are considered as external Linked Data resources,
* e.g. all resources not matching http://localhost and file:
* @param cacheContextUri the URI of the context to use for storing cached triples
*/
public KiWiLinkedDataSail(NotifyingSail baseSail, SesameFilter<Resource> acceptor, String cacheContextUri) {
this(baseSail, acceptor, cacheContextUri,null);
}
/**
* Creates a new SAIL with transparent Linked Data access. Caching information is stored in the underlying
* KiWi triple store.
*
* @param baseSail the wrapped SAIL; at the parent level must be a KiWiStore
* @param acceptor a filter that selects which resources are considered as external Linked Data resources,
* e.g. all resources not matching http://localhost and file:
* @param cacheContextUri the URI of the context to use for storing cached triples
*/
public KiWiLinkedDataSail(NotifyingSail baseSail, SesameFilter<Resource> acceptor, String cacheContextUri, ClientConfiguration clientConfiguration) {
super(baseSail);
this.store = getBaseStore();
this.cache_context = cacheContextUri;
this.acceptor = acceptor;
this.config = new CacheConfiguration();
if(clientConfiguration != null) {
config.setClientConfiguration(clientConfiguration);
}
}
@Override
public void initialize() throws SailException {
super.initialize();
backend = new LDCachingKiWiBackend(store, cache_context);
backend.initialize();
ldcache = new LDCache(config,backend);
}
@Override
public void shutDown() throws SailException {
ldcache.shutdown();
backend.shutdown();
super.shutDown();
}
@Override
public NotifyingSailConnection getConnection() throws SailException {
return new KiWiLinkedDataSailConnection(super.getConnection(),ldcache,acceptor);
}
/**
* Return the KiWi store that is at the base of the SAIL stack. Throws an IllegalArgumentException in case the base
* store is not a KiWi store.
*
* @return
*/
public KiWiStore getBaseStore() {
StackableSail current = this;
while(current != null && current.getBaseSail() instanceof StackableSail) {
current = (StackableSail) current.getBaseSail();
}
if(current != null && current.getBaseSail() instanceof KiWiStore) {
return (KiWiStore) current.getBaseSail();
} else {
throw new IllegalStateException("the base store is not a KiWiStore (type: "+current.getBaseSail().getClass().getCanonicalName()+")!");
}
}
public LDCachingKiWiBackend getBackend() {
return backend;
}
public LDCache getLDCache() {
return ldcache;
}
}